Submission #887269

#	Time	Username	Problem	Language	Result	Execution time	Memory
887269		hafo	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	120 ms	14676 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define pb push_back
#define pa pair<int, int>
#define pall pair<ll, int>
#define fi first
#define se second
#define TASK "test"
#define Size(x) (int) x.size()
#define all(x) x.begin(), x.end()
using namespace std;

template<typename T1, typename T2> bool mini (T1 &a, T2 b) {if(a > b) a = b; else return 0; return 1;}
template<typename T1, typename T2> bool maxi (T1 &a, T2 b) {if(a < b) a = b; else return 0; return 1;}

const int MOD = 1e9 + 7;
const int LOG = 20;
const int maxn = 2e5 + 7;
const ll oo = 1e18 + 69;

int n, q, s, t, a[maxn], l, r, x, type[maxn];

struct BIT {
    ll bit[maxn];

    void update(int x, ll val) {
        for(; x <= n; x += x&-x) bit[x] += val;
    }
    
    ll get(int x) {
        ll ans = 0;
        for(; x; x -= x&-x) ans += bit[x];
        return ans;
    }

} bit[2];

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    //freopen(TASK".inp", "r", stdin);
    //freopen(TASK".out", "w", stdout);

    cin>>n>>q>>s>>t;
    for(int i = 0; i <= n; i++) cin>>a[i];
    for(int i = 1; i <= n; i++) {
        type[i] = (a[i - 1] - a[i] >= 0);
        bit[type[i]].update(i, a[i - 1] - a[i]);
    }

    while(q--) {
        cin>>l>>r>>x;
        ll val = bit[type[l]].get(l) - bit[type[l]].get(l - 1);
        bit[type[l]].update(l, -val);
        val -= x;
        type[l] = (val >= 0);
        bit[type[l]].update(l, val);

        if(r < n) {
            val = bit[type[r + 1]].get(r + 1) - bit[type[r + 1]].get(r);
            bit[type[r + 1]].update(r + 1, -val);
            val += x;
            type[r + 1] = (val >= 0);
            bit[type[r + 1]].update(r + 1, val);
        }

        cout<<bit[0].get(n) * s + bit[1].get(n) * t<<"\n"; 
    }
    return 0;
}

• Subtask 1: 30 / 30
• Subtask 2: 10 / 10
• Subtask 3: 60 / 60